Boiler-feeder



(No Model.)

0. B. BOSWORTH. BOILER FEEDER.

No. 442,097. Patented Dec. 9, '1890.

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" U NITED STATES P TENT Orricn.

CHARLES E. BOSVVORTH, OF EVERETT, ASSIGNOR TO THE CROSBY ST 1AM BOILER- OF BOSTON, MASSACHUSETTS.

FEEDER.

SPECIFICATION forming part of Letters Patent No. 442,097, dated December 9, 1890.

Application filed March 5 1890- To all 'lIJ/LO/Ib [It may concern..-

'ie it known that I, CHARLES E. BOSWORTH, a citizen of the United States, residing at Everett-,in the county of Middlesex and State of 5 Massachusetts, have invented certain new and useful Improvements in Devices for Automatically Supplying and Regulating the Feed- \Vat.er to Steam-Boilers, of which the following is a specification, reference being had to IO the accompanying drawings, and to letters marked thereon.

Referring to the drawings, Figure l represents in elevation a side view of the entire device, showing, its several parts in combination; and Fig. 2 represents in sectional elevation certain of these parts on an enlarged scale.

Of the parts shown in combination, A is a hollow cylinder capped at either end, and

having at its upper end a pipe B, connecting it with the steam-space of the boiler, and at its lower end a pipe O, connecting it with the water-space of the boiler. This hollow cylinder has mounted upon it a glass water-gage z 5 a of the kind usually employed to show the level of the water in a steam-boiler, so that when the top of the water shows up to the middle of the glass it is at the proper working-level both in cylinder A and in the steam- 0 boiler. At this point the thermostat D is inserted in the cylinder A, thus connecting the interior of the GXpELl1SlOl1l'/Llb6 b of the thermostat with the interior of the cylinder A, and by means of its connecting-pipes B and 3 5 O with the interior of the steam-boiler.

The thermostat D embraces in its construction the expansion-pipe h, which at its inner endis open to the interior of the cylinder-A and closed at its outer end by a suitable screw-cap e, from which depends a rigid guide 6' for the outer end of the rod (Z. The rod 0 at its inner end is firmly screwed into the connecting-nut f and at its outer end is guided in the metal of the cap 0. To the outer ends of the rods c and d are shackled the two ends of the lever g, the fulcrum being at c and the operating force at the set-screw 71.. The inner point of rod (1 isformed into a conical valve d, which controls the passage j, connecting the expansion-pipe l) with the steam-pipe i. A compressed spiral spring (1", mounted 011 the rod Serial No. 342.827. (N0 model.)

(Z and controlled by a collar and set-screw at it, keeps the conical valve (1' to its seat, unless forced therefrom by the expansion of the tube Z2, operating through the lever g. Rod 61 is also provided with a packing-box at l to prevent leakage. The rod 0 is of iron, the rod (1 of iron or brass, and the expansion-tube b is of brass.

E represents an injector or inspirator of the character usually employedin feeding water to steam boilers, and the valves of which are operative by a single lever, as at F. The steam enters the injector or inspirator at pipe G, the water being drawn into the instrument through suction-nozzle H and delivered into the steam-boiler through a pipe connected with the'inj ector at I. An overflowpipeis connected at J to carry oif the waste water.

In the line of connection between the thermostat and the injector is placed a small steamcylinder K, having a screw cap at either end an and n and inelosing a piston o and piston-rod p, which are pushed forward by steam which enters the cylinder from the pipe 2', connected with the thermostat. At the opposite end of this small cylinder the pistonrod p passes through the cap in as a guide, and is extended to make connection with the top of the lever F.

Within the cylinder K is a spiral spring g, which bears upon the piston 0 and against the opposite head of the cylinder. This spiral spring returns the piston to its primary position when the pressure upon it is removed. Inserted in the steam-pipe I; is a drip-cock r for d raining the pipe, as may be desired. Also by the adjustment of this cock there is made sufficient outlet to permit steam and condensewater to escape, and thus allow the more rapid back-stroke of the piston. Another pet cock may be inserted in the lower side of cylinder K, near to cap m, to be used for similar purposes.

The operation of my boiler-feeding device is as follows: When the water in the steamboiler has fallen to the lowest prescribed limit, as at a, steam from the upper part of cylinder A will enter the tube Z) of the thermostat, expanding it by the accession of temperature. The longitudinal expansion of the tube 1) operates upon the lever 9 through the setscrew h, moving the rod (1 outward and opening the conical valve (1 and passage 7', per mitting steam from the cylinderA to flow into the pipe i and press forward thepiston of the cylinder K, the piston-rod of which is directly connected to the head of the controlling-lever F of the injector, so that the said lever is thrown over to its opposite extreme of movement by a single stroke of the piston, and the feeding beg-ins. Now, when by the operation of the injector the water has risen in the cylinder A to a point slightly above the expansion-tube b of the thermostat, the'water therein is cooled by radiation and the tube contracts, permitting the spiral spring d", which presses on the collar 70, to close the valve 61 and shut off the pressure from the pipe 1' and cylinder K, in which case the piston 0 and piston-rod p of the cylinder K, and the controlliugdever F, connected therewith, will return to the primary position shown in the drawings under the resilient action of the spring (1, to be ready for the next operation.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination of the injector and its operative piston, a thermostatic instrument communicating with the piston, and a dripcock located in the pipe between the piston and thermostaticinstrumen t, asset forth.

2. The ocmbination, with a steam-injector and its operative piston, of a thermostatic in.- strument consisting of a tubularstem adapted to be connected with the boiler and communicating with the piston, such instrument being provided with a valve where it communicates with the piston, a spring for actuating such valve, and a lever bearing against such 4c spring and secured to the stem, as set forth.

CHARLES B. BOSWOR'FH.

Witnesses:

JOSHUA H. MILLETT, WM. BURNETT. 

